"Now they might add it to P7?" God, I hope not! Do you realize the kind of process-intensive light calculations that go into HDRI, or even basic global illumination? Given Poser's renderer, it would take weeks to render an image using it. Not to mention, Poser still hasn't perfected the use of point lights (or omni-directional lights) yet. In fact, they just introduced them for the first time in P6, and still haven't figured out a way to incorporate shadow-maps with them. No, I think low dynamic range IBL and AO is just perfect for Poser. When done right, it can give you results that are at least close or similar to HDRI, and in a fraction of the time. UNLESS Poser 7 allows the use of other plug-in render technology, like Vray for example, I don't think gluing on another fancy rendering option like HDRI to the current firefly technology is going to be very smart at this point. Don't forget, Firefly is still very young in terms of development (even though it's core is based on a tried-and-true render technology), so I think it needs more time before we throw something like that at it. Heck, people are complaining about the speed of it's rendering all the time as it is now. Imagine what would happen if they could do HDRI with it? There'd be mutiny. LOL.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.